Saturday, July 14, 2012

Formative Assessment - CBSE Class 8th science Microorganisms


1. The curd contains -----bacteria which helps to change the milk into curd
Lacto bacillus
2. -------------is used for commercial production of alcohol and wine.
Yeast
3. Process of conservation of sugar into alcohol is known as ----------------
Fermentation.
4. Disease causing microorganisms are called -------------------------
Pathogens
5. Virus is a Latin word which means -----------------
Poison
6. Virus is a Latin word which means------------------.
Poison
7. ------------ are on the border line between living and non-living organisms
Virus

8. The study of bacteria is called ------------------------
Bacteriology.
9. Virus was discovered by ------------ in 1892
Ivanowsky
10. ------------ Viruses show both living and non-living characteristics
Virus
11. The study of bacteria is called -----------
Bacteriology
12. Bacteria were first observed under a microscope by ------------------
Anton Von Leeuwenhoek
13. The study of algae is called -------------------
Phycology
14. Cocci is ----------shaped) where as Bacilli is --------------shaped bacteria.
Spherical, Rod
15. -------------------is a unicellular green algae
Chlamydomonas
16. The study of fungi is called --------------
Mycology.
17. Fungi do not possess ---------and led a lead a parasitic or saprophytic mode of life.
Chlorophyll
18. A black powdery spot with a network of thread like filaments in fungi , called -----
Hyphae
19. Azatobactor, Clostridium, Rhizobium are ---- fixing bacteria.
Nitrogen
20. Oscillatoria, Anabaena and Nostoc are - which increase the soil fertility by fixing atmospheric nitrogen.
Blue green algae
21. Vinegar is manufactured from sugar solution using -----------
Acetobacter aceti.
22. Some algae produce dense masses of materials that cover the water surface, thereby decrease the oxygen content of water is called …………..
Algal bloom
23. -----------------is a science which deals with diseases of plants, animals and human beings caused by viruses, bacteria and fungi.
Pathology
24. Algal bloom leads to loss of species diversity which is known as -------
Eutrophication
25. Milk is heated to 72ofor 30 minutes and then suddenly cooled to 12oC.is called -----
Pasteurization

1 comment:

willson said...

Prior to the boards examination sample papers are good for practicing.icse board papers 2011

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